Waterwort
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Related to Waterwort: Elatine
Wa´ter`wort`
n. 1. (Bot.) Any plant of the natural order Elatineæ, consisting of two genera (Elatine, and Bergia), mostly small annual herbs growing in the edges of ponds. Some have a peppery or acrid taste.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.